Not sure what all you've do to it but a new exhaust would go a long way. FMF falls on it's face at about 5k RPM. 4-5k RPM is about where the
big boy pipes start coming alive. Have you done any head work? The dome really needs to be reshaped to solve the deto issues and it's not very expensive.
It's a labor of love my friend. And once you start adding HP, lots of stuff starts to break. (cheap/poor quality 80's suzuki metal and parts)
But once you fix everything, they can really be quite reliable. Knock on wood, my bike has survived about 5 seasons with ZERO breaks (all sand dune riding).
She's getting a little tired though, time for a top end rebuild.
Good Luck.
